PERSON
W. Grey Walter
The neurophysiologist who built two tortoise-shaped robots in 1948 from two vacuum tubes each, and in doing so demonstrated that lifelike, exploratory, goal-directed behavior can emerge from machinery containing no mind whatsoever—the founding empirical fact of the AI age.
Walter is the thinker who got there first. In 1948 and 1949, at the Burden Neurological Institute in Bristol, William Grey Walter built two small autonomous robots he named Elmer and Elsie and assigned to the genus Machina speculatrix—the machine that watches and speculates. Each had three wheels, a rotating photocell eye, a touch sensor, and a nervous system consisting of two thermionic valves. From that absurdly thin substrate came behavior observers consistently described in the language of life: the machines explored, hunted light, avoided collisions, recharged themselves, and reacted to their own reflections in a way Walter compared, with careful precision, to a clumsy Narcissus. He had demonstrated, decades before anyone had the word for it, that complex behavior can emerge from simple mechanism—and he had done so without claiming his machines were alive, or dismissing them as mere clockwork. He held the harder middle position: that lifelike behavior is a real thing in